It doesn't surprise me too much. Ole Miss losing to Belmont kinda does, but Ole Miss is still a middle-of-the-pack conference team, whose future seems positive.
Most of the SEC teams that have losses thus far this season - Vanderbilt, Auburn, Florida, Missouri, Alabama - were the bottom 5 of the conference in the media's pre-season conference rankings. They are a combined 5-6 thus far. 2 of those wins are Missouri's, who hasn't played any tough opponents yet.
The rest of the top 9 are a combined 16-4 thus far. #7 LSU and #8 Ole Miss are a combined 2-2. SC, UT, TAMU, UK, UGA, Arky, and #9 Miss St. are a combined 14-2 thus far. Those 2 losses are UK's to Indiana, and Arky's to CT - both of those opponents are nationally top 10 and were favored in their games.
I would not call today's results as the SEC "going down in flames". Those bottom 5 or so teams were already expected to have struggling seasons this season, with new rosters, new staffs, or both. Teams like Ole Miss, LSU, and Miss St. have talent and/or promising futures, but as far as taking major steps forward THIS season, is a total mystery. They'll most likely get some quality wins, but could also get some embarrassing losses along the way as well.
The top 6 mentioned above will be the conference leaders who have a chance to reach into the NCAAT. This was already understood before the season began. ESPN's Charlie Creme has 9 SEC teams making the NCAAT, with pre-season #11 Missouri jumping past #10 Alabama and #9 Miss St. to get in as the "last four in", and #9 Miss St. being in the "first four out", and Alabama not given any consideration at all. USC is the only SEC #1 Seed, Kentucky is a #3 Seed, and both Tennessee and Texas A&M - the #2 and #3 pre-season media picks for the SEC - were both #5 Seeds. After them, Arkansas and LSU were #9 Seeds....